3 Principle of MeasurementIf the particles or molecules are illuminated with a laser, the intensity of the scattered light fluctuates at a rate that is dependent upon the size of the particlesAnalysis of these intensity fluctuations yields the velocity of the Brownian motion and hence the particle size using the Stokes-Einstein relationship.

4 Temperature and viscosity must be knownBrownian MotionParticles, emulsions and molecules in suspension undergo Brownian motion.This is the motion induced by the bombardment by solvent molecules that themselves are moving due to their thermal energyTemperature and viscosity must be known

16 turbidity is linear with concentrationLowconcentrationturbidity is linear with concentrationHighconcentrationParticles are so close together that the scattered radiation is re-scattered by other particles.

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